Adjust tower unit. Stand on bottom step on balls of feet, leaving heels free. Grip front bar to maintain balance.
Raise heels until you are on tiptoes. Hold this position briefly. Slowly lower heels as far as possible. Repeat until a full movement is no longer possible.
The exercise can also be done on one leg. This doubles the load on the calf muscle. The exercise can be further intensified by attaching the belt to the lever arm and selecting an appropriate weight.

Important: Upper body and legs form straight line. Make sure that you extend fully.